TABLES. 



Table 1. The production of gashiihhles (0^'^) hy green Spongillidae 

 in hright day- or sun-light. Sponges nêwly captured; placed separa- 

 tely into cylindrical glass vessels — capacity 5 L. (a. h.) or 3 L. (c.) — 

 füled with water from the conduit, in the open air; sponge-pieces of 

 equal volume in all series of experiments; an inverted funnel and tube 

 placed under water over each piece. The sponges in darkness under 

 a light-tight case. Column A indicates the presence (-f ) or absence ( — ) 

 of gasbubbles within or at the outside of the sponge tissue ; column B 

 the same for the inside of funnel and tube; column C the same for 

 all outside the funnel and tube. Tlie sign = indicates the number of 

 gasbubbles to be unchanged. All series of experiments are mentioned. 

 As for the discussion, see pag. 18. In c. the green sponge-pieces are 

 taken from one specimen. 



a. Spongillae; in light; vol. lO cM^. 



